CUMILOX High Alumina refractories are produced from fused and sintered alumina for high purity range from 85 – 99.5% alumina. Calcined Bauxite, Chamotte, etc. are used for 85% alumina and below. High purity alumina, being a stable oxide, is inert to corrosive attack in oxidizing atmospheres and can also withstand highly reducing atmospheres. It can also withstand high temperature hydrogen attack and is indispensable in applications which encounter hydrogen attack. CUMILOX possesses all these inherent characteristics of alumina and more.


  85% Alumina, Fused brown alumina with phosphate bond
PROPERTIESUNITLimit ValueTypical Value
Maximum Hot Face Temperatureo C16501650
Bulk Densitygm/cc2.70 min.2.75
Apparent Porosity%21.0 max.19
Cold Crushing StrengthKg/cm2800 min.1000
Modulus of RuptureKg/cm2  
At Room Temperature 150 min.200
At  1250o C 75 min.100
Reheat Change %  
After heating at 1450°C for 6 hrs.  +/- 0.25 max.
Thermal ConductivityW/m K  
At 800o C Hot Face Temperature 3.0 max.2.74
At 1000o C Hot Face Temperature 3.2 max.2.47
At 1200o C Hot Face Temperature 3.0 max.2.78
Chemical Analysis %   
Al2O3 85.0 min.85.55
SiO2 10.0 max.8.32
Fe2O3 1.0 max.0.65
P2O5 4.0 max.2.97
TiO2 2.5 max.1.53
Recommended Laying Mortars CUMIBOND LA FX 
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